Merge branch 'prim_modes' into 'master'
Add remainder of OpenGL primitive modes See merge request simulant/GLdc!127
This commit is contained in:
Luke Benstead
commit
57d5a59d65
@ -209,6 +209,7 @@ gen_sample(scissor samples/scissor/main.c)
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gen_sample(polymark samples/polymark/main.c)
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gen_sample(cubes samples/cubes/main.cpp)
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gen_sample(zclip_test tests/zclip/main.cpp)
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gen_sample(primitive_modes samples/primitive_modes/main.c)
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if(PLATFORM_DREAMCAST)
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gen_sample(trimark samples/trimark/main.c)
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196
GL/draw.c
196
GL/draw.c
@ -435,21 +435,147 @@ GL_FORCE_INLINE void genTriangleStrip(Vertex* output, GLuint count) {
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output[count - 1].flags = GPU_CMD_VERTEX_EOL;
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}
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static void genTriangleFan(Vertex* output, GLuint count) {
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gl_assert(count <= 255);
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#define QUADSTRIP_COUNT(count) (((count) - 2) * 2)
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static GL_NO_INLINE void genQuadStrip(Vertex* output, GLuint count) {
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Vertex* dst = output + QUADSTRIP_COUNT(count) - 1;
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Vertex* src = output + count;//(count - 1);
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Vertex* dst = output + (((count - 2) * 3) - 1);
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Vertex* src = output + (count - 1);
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for (; count > 2; count -= 2) {
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// Have to copy because of src/dst overlapping on first quad
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Vertex src1 = src[-1], src2 = src[-2], src3 = src[-3], src4 = src[-4];
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GLubyte i = count - 2;
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while(i--) {
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*dst = *src--;
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*dst = src3;
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(*dst--).flags = GPU_CMD_VERTEX_EOL;
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*dst-- = src4;
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*dst-- = src1;
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*dst-- = src2;
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src -= 2;
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}
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}
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#define TRIFAN_COUNT(count) (((count) - 2) * 3)
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static GL_NO_INLINE void genTriangleFan(Vertex* output, GLuint count) {
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Vertex* dst = output + TRIFAN_COUNT(count) - 1;
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Vertex* src = output + count - 1;
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// Triangles generated as {first vertex, prior vertex, current vertex}
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// e.g. {v1, v2, v3, v4} produces {v1, v2, v3}, {v1, v3, v4}
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for (; count > 2; count--) {
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*dst = *src--;
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(*dst--).flags = GPU_CMD_VERTEX_EOL;
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*dst-- = *src;
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*dst-- = *output;
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}
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}
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#define POINTS_COUNT(count) ((count) * 4)
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static GL_NO_INLINE void genPoints(Vertex* output, GLuint count) {
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Vertex* dst = output + POINTS_COUNT(count) - 1;
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Vertex* src = output + count - 1;
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float half_size = HALF_POINT_SIZE;
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// Expands v to { v + (-S/2,S/2), v + (S/2,S/2), v + (-S/2,S/2), (S/2,-S/2) }
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for (; count > 0; count--, src--) {
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*dst = *src;
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dst->flags = GPU_CMD_VERTEX_EOL;
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dst->xyz[0] -= half_size; dst->xyz[1] -= half_size;
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dst--;
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*dst = *src;
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dst->xyz[0] += half_size; dst->xyz[1] -= half_size;
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dst--;
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*dst = *src;
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dst->xyz[0] -= half_size; dst->xyz[1] += half_size;
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dst--;
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*dst = *src;
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dst->xyz[0] += half_size; dst->xyz[1] += half_size;
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dst--;
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}
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}
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// Heavily based on the pvrline example by jnmartin84
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// Which is based on https://devcry.heiho.net/html/2017/20170820-opengl-line-drawing.html
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static Vertex* draw_line(Vertex* dst, Vertex* v1, Vertex* v2) {
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Vertex ov1 = *v1;
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Vertex ov2 = *v2;
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// TODO don't copy unless dst might overlap v1/v2
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// Essentially "expands" a line into a quad by
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// 1) Calculating normal of the line from v1 to v2
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// 2) Scaling normal by the line width
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// 3) Offseting the endpoints wrt the scaled normal
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float dx = ov2.xyz[0] - ov1.xyz[0];
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float dy = ov2.xyz[1] - ov1.xyz[1];
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float inverse_mag = fast_rsqrt((dx*dx) + (dy*dy)) * HALF_LINE_WIDTH;
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float nx = -dy * inverse_mag;
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float ny = dx * inverse_mag;
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// Expand first endpoint both "up" and "down"
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*dst = ov1;
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dst->flags = GPU_CMD_VERTEX_EOL;
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dst->xyz[0] += nx;
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dst->xyz[1] += ny;
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dst--;
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*dst = ov1;
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dst->xyz[0] -= nx;
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dst->xyz[1] -= ny;
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dst--;
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// Expand second endpoint both "up" and "down"
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*dst = ov2;
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dst->xyz[0] += nx;
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dst->xyz[1] += ny;
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dst--;
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*dst = ov2;
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dst->xyz[0] -= nx;
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dst->xyz[1] -= ny;
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dst--;
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return dst;
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}
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#define LINES_COUNT(count) (((count) / 2) * 4)
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static GL_NO_INLINE void genLines(Vertex* output, GLuint count) {
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Vertex* dst = output + LINES_COUNT(count) - 1;
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Vertex* src = output + count - 1;
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// Draws line using two vertices
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for (; count >= 2; count -= 2, src -= 2) {
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dst = draw_line(dst, src, src - 1);
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}
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}
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#define LINE_STRIP_COUNT(count) (((count) - 1) * 4)
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static GL_NO_INLINE void genLineStrip(Vertex* output, GLuint count) {
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Vertex* dst = output + LINE_STRIP_COUNT(count) - 1;
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Vertex* src = output + count - 1;
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// Draws line using current and prior vertex
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for (; count > 1; count--, src--) {
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dst = draw_line(dst, src, src - 1);
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}
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}
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#define LINE_LOOP_COUNT(count) ((count) * 4)
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static GL_NO_INLINE void genLineLoop(Vertex* output, GLuint count) {
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Vertex* dst = output + LINE_LOOP_COUNT(count) - 1;
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Vertex* src = output + count - 1;
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Vertex last = *src, first = *output;
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// Draws line using current and prior vertex
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for (; count > 1; count--, src--) {
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dst = draw_line(dst, src, src - 1);
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}
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// Connect first and last vertex
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draw_line(dst, &first, &last);
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}
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typedef void (*ReadPositionFunc)(const GLubyte*, GLubyte*);
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typedef void (*ReadDiffuseFunc)(const GLubyte*, GLubyte*);
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typedef void (*ReadUVFunc)(const GLubyte*, GLubyte*);
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@ -891,11 +1017,28 @@ static void generate(SubmissionTarget* target, const GLenum mode, const GLsizei
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case GL_QUADS:
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genQuads(it, count);
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break;
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case GL_TRIANGLE_STRIP:
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genTriangleStrip(it, count);
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break;
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case GL_QUAD_STRIP:
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genQuadStrip(it, count);
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break;
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case GL_TRIANGLE_FAN:
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genTriangleFan(it, count);
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break;
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case GL_TRIANGLE_STRIP:
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genTriangleStrip(it, count);
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case GL_POINTS:
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genPoints(it, count);
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break;
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case GL_LINES:
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genLines(it, count);
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break;
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case GL_LINE_STRIP:
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genLineStrip(it, count);
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break;
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case GL_LINE_LOOP:
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genLineLoop(it, count);
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break;
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default:
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gl_assert(0 && "Not Implemented");
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@ -1093,6 +1236,23 @@ void _glInitSubmissionTarget() {
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target->extras = &VERTEX_EXTRAS;
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}
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GL_FORCE_INLINE GLuint calcFinalVertices(GLenum mode, GLuint count) {
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switch (mode) {
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case GL_POINTS:
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return POINTS_COUNT(count);
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case GL_LINE_LOOP:
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return LINE_LOOP_COUNT(count);
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case GL_LINE_STRIP:
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return LINE_STRIP_COUNT(count);
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case GL_LINES:
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return LINES_COUNT(count);
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case GL_TRIANGLE_FAN:
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return TRIFAN_COUNT(count);
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case GL_QUAD_STRIP:
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return QUADSTRIP_COUNT(count);
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}
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return count;
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}
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GL_FORCE_INLINE void submitVertices(GLenum mode, GLsizei first, GLuint count, GLenum type, const GLvoid* indices) {
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@ -1102,14 +1262,10 @@ GL_FORCE_INLINE void submitVertices(GLenum mode, GLsizei first, GLuint count, GL
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TRACE();
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/* Do nothing if vertices aren't enabled */
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if(!(ENABLED_VERTEX_ATTRIBUTES & VERTEX_ENABLED_FLAG)) {
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return;
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}
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if(!(ENABLED_VERTEX_ATTRIBUTES & VERTEX_ENABLED_FLAG)) return;
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/* No vertices? Do nothing */
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if(!count) {
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return;
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}
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if(!count) return;
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/* Polygons are treated as triangle fans, the only time this would be a
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* problem is if we supported glPolygonMode(..., GL_LINE) but we don't.
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@ -1131,14 +1287,6 @@ GL_FORCE_INLINE void submitVertices(GLenum mode, GLsizei first, GLuint count, GL
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}
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}
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if(mode == GL_LINE_STRIP || mode == GL_LINES) {
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fprintf(stderr, "Line drawing is currently unsupported\n");
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return;
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}
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// We don't handle this any further, so just make sure we never pass it down */
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gl_assert(mode != GL_POLYGON);
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target->output = _glActivePolyList();
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gl_assert(target->output);
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gl_assert(extras);
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@ -1147,7 +1295,7 @@ GL_FORCE_INLINE void submitVertices(GLenum mode, GLsizei first, GLuint count, GL
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GLboolean header_required = (vector_size == 0) || _glGPUStateIsDirty();
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target->count = (mode == GL_TRIANGLE_FAN) ? ((count - 2) * 3) : count;
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target->count = calcFinalVertices(mode, count);
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target->header_offset = vector_size;
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target->start_offset = target->header_offset + (header_required ? 1 : 0);
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10
GL/private.h
10
GL/private.h
@ -25,6 +25,7 @@ extern void* memcpy4 (void *dest, const void *src, size_t count);
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#define GL_NO_INSTRUMENT inline __attribute__((no_instrument_function))
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#define GL_INLINE_DEBUG GL_NO_INSTRUMENT __attribute__((always_inline))
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#define GL_FORCE_INLINE static GL_INLINE_DEBUG
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#define GL_NO_INLINE __attribute__((noinline))
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#define _GL_UNUSED(x) (void)(x)
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#define _PACK4(v) ((v * 0xF) / 0xFF)
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@ -259,6 +260,12 @@ do { \
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memcpy_vertex(b, &c); \
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} while(0)
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#ifdef __DREAMCAST__
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#define fast_rsqrt(x) frsqrt(x)
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#else
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#define fast_rsqrt(x) (1.0f / __builtin_sqrtf(x))
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#endif
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/* ClipVertex doesn't have room for these, so we need to parse them
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* out separately. Potentially 'w' will be housed here if we support oargb */
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typedef struct {
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@ -320,6 +327,9 @@ void _glMatrixLoadModelViewProjection();
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extern GLfloat DEPTH_RANGE_MULTIPLIER_L;
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extern GLfloat DEPTH_RANGE_MULTIPLIER_H;
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extern GLfloat HALF_LINE_WIDTH;
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extern GLfloat HALF_POINT_SIZE;
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Matrix4x4* _glGetProjectionMatrix();
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Matrix4x4* _glGetModelViewMatrix();
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@ -3,7 +3,8 @@
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#include <stdio.h>
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#include "private.h"
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GLfloat HALF_LINE_WIDTH = 1.0f / 2.0f;
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GLfloat HALF_POINT_SIZE = 1.0f / 2.0f;
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static struct {
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GLboolean is_dirty;
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@ -773,7 +774,11 @@ GLAPI void APIENTRY glAlphaFunc(GLenum func, GLclampf ref) {
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}
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void glLineWidth(GLfloat width) {
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_GL_UNUSED(width);
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HALF_LINE_WIDTH = width / 2.0f;
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}
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void glPointSize(GLfloat size) {
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HALF_POINT_SIZE = size / 2.0f;
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}
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void glPolygonOffset(GLfloat factor, GLfloat units) {
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@ -552,6 +552,10 @@ GLAPI GLvoid APIENTRY glRecti(GLint x1, GLint y1, GLint x2, GLint y2);
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GLAPI GLvoid APIENTRY glRectiv(const GLint *v1, const GLint *v2);
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#define glRectsv glRectiv
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/* Primitive configuration */
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GLAPI void APIENTRY glLineWidth(GLfloat width);
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GLAPI void APIENTRY glPointSize(GLfloat size);
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/* Enable / Disable Capability */
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/* Currently Supported Capabilities:
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GL_TEXTURE_2D
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@ -742,7 +746,6 @@ GLAPI GLenum APIENTRY glGetError(void);
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/* Non Operational Stubs for portability */
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GLAPI void APIENTRY glAlphaFunc(GLenum func, GLclampf ref);
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GLAPI void APIENTRY glLineWidth(GLfloat width);
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GLAPI void APIENTRY glPolygonMode(GLenum face, GLenum mode);
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GLAPI void APIENTRY glPolygonOffset(GLfloat factor, GLfloat units);
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GLAPI void APIENTRY glGetTexParameterfv(GLenum target, GLenum pname, GLfloat *params);
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189
samples/primitive_modes/main.c
Normal file
189
samples/primitive_modes/main.c
Normal file
@ -0,0 +1,189 @@
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#include <GL/gl.h>
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#include <math.h>
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#include <stdlib.h>
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#ifdef SDL2_BUILD
|
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#include <SDL2/SDL.h>
|
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static SDL_Window* win_handle;
|
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#else
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#include <GL/glkos.h>
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#endif
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|
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static void DrawLineLoop(float y) {
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glBegin(GL_LINE_LOOP);
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glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(410.0f, y + 10.0f);
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glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(490.0f, y + 10.0f);
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glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(490.0f, y + 90.0f);
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glColor3f(1.0f, 1.0f, 1.0f); glVertex2f(410.0f, y + 90.0f);
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glEnd();
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}
|
||||
|
||||
static void DrawLineStrip(float y) {
|
||||
glBegin(GL_LINE_STRIP);
|
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glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(310.0f, y + 10.0f);
|
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glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(390.0f, y + 10.0f);
|
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glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(390.0f, y + 90.0f);
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glColor3f(1.0f, 1.0f, 1.0f); glVertex2f(310.0f, y + 90.0f);
|
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glEnd();
|
||||
}
|
||||
|
||||
static void DrawLine(float y) {
|
||||
glBegin(GL_LINES);
|
||||
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(210.0f, y + 10.0f);
|
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glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(290.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(290.0f, y + 90.0f);
|
||||
glColor3f(1.0f, 1.0f, 1.0f); glVertex2f(210.0f, y + 90.0f);
|
||||
|
||||
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(230.0f, y + 25.0f);
|
||||
glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(250.0f, y + 75.0f);
|
||||
glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(260.0f, y + 75.0f);
|
||||
glColor3f(1.0f, 1.0f, 1.0f); glVertex2f(280.0f, y + 45.0f);
|
||||
glEnd();
|
||||
}
|
||||
|
||||
static void DrawPoint(float y) {
|
||||
glBegin(GL_POINTS);
|
||||
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(110.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(190.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(190.0f, y + 90.0f);
|
||||
glColor3f(1.0f, 1.0f, 1.0f); glVertex2f(110.0f, y + 90.0f);
|
||||
glEnd();
|
||||
}
|
||||
|
||||
static void DrawQuad(float y) {
|
||||
glBegin(GL_QUADS);
|
||||
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(10.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(90.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(90.0f, y + 90.0f);
|
||||
glColor3f(1.0f, 1.0f, 1.0f); glVertex2f(10.0f, y + 90.0f);
|
||||
|
||||
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(110.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(190.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(190.0f, y + 90.0f);
|
||||
glColor3f(1.0f, 1.0f, 1.0f); glVertex2f(110.0f, y + 90.0f);
|
||||
glEnd();
|
||||
}
|
||||
|
||||
static void DrawQuadStrip(float y) {
|
||||
glBegin(GL_QUAD_STRIP);
|
||||
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(210.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(290.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(290.0f, y + 90.0f);
|
||||
glColor3f(1.0f, 1.0f, 1.0f); glVertex2f(210.0f, y + 90.0f);
|
||||
|
||||
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(310.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(390.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(390.0f, y + 90.0f);
|
||||
glColor3f(1.0f, 1.0f, 1.0f); glVertex2f(310.0f, y + 90.0f);
|
||||
glEnd();
|
||||
}
|
||||
|
||||
static void DrawTriList(float y) {
|
||||
glBegin(GL_TRIANGLES);
|
||||
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f( 10.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 1.0f, 0.0f); glVertex2f( 90.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 0.0f, 1.0f); glVertex2f( 90.0f, y + 90.0f);
|
||||
|
||||
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(110.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(190.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(190.0f, y + 90.0f);
|
||||
glEnd();
|
||||
}
|
||||
|
||||
static void DrawTriStrip(float y) {
|
||||
glBegin(GL_TRIANGLE_STRIP);
|
||||
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(210.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(290.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(290.0f, y + 90.0f);
|
||||
glColor3f(1.0f, 1.0f, 1.0f); glVertex2f(210.0f, y + 90.0f);
|
||||
|
||||
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(310.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(390.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(390.0f, y + 90.0f);
|
||||
glColor3f(1.0f, 1.0f, 1.0f); glVertex2f(310.0f, y + 90.0f);
|
||||
glEnd();
|
||||
}
|
||||
|
||||
|
||||
static void DrawTriFan(float y) {
|
||||
glBegin(GL_TRIANGLE_FAN);
|
||||
glColor3f(1.0f, 0.0f, 0.0f); glVertex2f(410.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(490.0f, y + 10.0f);
|
||||
glColor3f(0.0f, 0.0f, 1.0f); glVertex2f(445.0f, y + 90.0f);
|
||||
|
||||
glColor3f(0.0f, 1.0f, 0.0f); glVertex2f(590.0f, y + 10.0f);
|
||||
glColor3f(1.0f, 1.0f, 1.0f); glVertex2f(510.0f, y + 45.0f);
|
||||
glEnd();
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[]) {
|
||||
#ifdef SDL2_BUILD
|
||||
SDL_Init(SDL_INIT_EVERYTHING);
|
||||
win_handle = SDL_CreateWindow("Shapes", 0, 0, 640, 480, SDL_WINDOW_OPENGL);
|
||||
SDL_GL_CreateContext(win_handle);
|
||||
#else
|
||||
glKosInit();
|
||||
#endif
|
||||
|
||||
glClearColor(0.5f, 0.5f, 0.5f, 1);
|
||||
glViewport(0, 0, 640, 480);
|
||||
|
||||
float mat[4][4] = { 0 };
|
||||
float L = 0, T = 0, R = 640, B = 480, N = -100, F = 100;
|
||||
mat[0][0] = 2.0f / (R - L);
|
||||
mat[1][1] = 2.0f / (T - B);
|
||||
mat[2][2] = -2.0f / (F - N);
|
||||
mat[3][0] = -(R + L) / (R - L);
|
||||
mat[3][1] = -(T + B) / (T - B);
|
||||
mat[3][2] = -(F + N) / (F - N);
|
||||
mat[3][3] = 1;
|
||||
glLoadMatrixf(mat);
|
||||
|
||||
int running = 1;
|
||||
|
||||
while (running) {
|
||||
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
|
||||
|
||||
#ifdef SDL2_BUILD
|
||||
SDL_Event event;
|
||||
while (SDL_PollEvent(&event)) {
|
||||
if(event.type == SDL_QUIT) running = 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
DrawTriStrip(300);
|
||||
DrawTriFan(300);
|
||||
DrawTriList(300);
|
||||
|
||||
DrawQuadStrip(200);
|
||||
DrawQuad(200);
|
||||
|
||||
glPointSize(5);
|
||||
DrawPoint(100);
|
||||
glLineWidth(0.5f);
|
||||
DrawLineLoop(100);
|
||||
glLineWidth(2);
|
||||
DrawLineStrip(100);
|
||||
glLineWidth(10);
|
||||
DrawLine(100);
|
||||
|
||||
glPointSize(1);
|
||||
glLineWidth(1);
|
||||
DrawPoint(0);
|
||||
DrawLineLoop(0);
|
||||
DrawLineStrip(0);
|
||||
DrawLine(0);
|
||||
|
||||
glShadeModel(GL_FLAT);
|
||||
DrawQuad(400);
|
||||
DrawTriStrip(400);
|
||||
glShadeModel(GL_SMOOTH);
|
||||
|
||||
#ifdef SDL2_BUILD
|
||||
SDL_GL_SwapWindow(win_handle);
|
||||
#else
|
||||
glKosSwapBuffers();
|
||||
#endif
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user