282 lines
7.6 KiB
C
282 lines
7.6 KiB
C
#include <stdio.h>
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#include "private.h"
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#include "../include/glkos.h"
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#include "../include/glext.h"
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typedef struct {
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GLuint index;
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GLuint texture_id;
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GLboolean is_complete;
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/* FIXME: Add OP, TR and PT lists per framebuffer */
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} FrameBuffer;
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static FrameBuffer* ACTIVE_FRAMEBUFFER = NULL;
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static NamedArray FRAMEBUFFERS;
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void _glInitFramebuffers() {
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named_array_init(&FRAMEBUFFERS, sizeof(FrameBuffer), 32);
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// Reserve zero so that it is never given to anyone as an ID!
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named_array_reserve(&FRAMEBUFFERS, 0);
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}
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void _glWipeTextureOnFramebuffers(GLuint texture) {
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/* Spec says we don't update inactive framebuffers, they'll presumably just cause
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* a GL_INVALID_OPERATION if we try to render to them */
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if(ACTIVE_FRAMEBUFFER && ACTIVE_FRAMEBUFFER->texture_id == texture) {
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ACTIVE_FRAMEBUFFER->texture_id = 0;
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}
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}
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void APIENTRY glGenFramebuffersEXT(GLsizei n, GLuint* framebuffers) {
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TRACE();
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while(n--) {
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GLuint id = 0;
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FrameBuffer* fb = (FrameBuffer*) named_array_alloc(&FRAMEBUFFERS, &id);
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fb->index = id;
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fb->is_complete = GL_FALSE;
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fb->texture_id = 0;
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*framebuffers = id;
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framebuffers++;
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}
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}
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void APIENTRY glDeleteFramebuffersEXT(GLsizei n, const GLuint* framebuffers) {
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TRACE();
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while(n--) {
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FrameBuffer* fb = (FrameBuffer*) named_array_get(&FRAMEBUFFERS, *framebuffers);
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if(fb == ACTIVE_FRAMEBUFFER) {
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ACTIVE_FRAMEBUFFER = NULL;
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}
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named_array_release(&FRAMEBUFFERS, *framebuffers++);
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}
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}
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void APIENTRY glBindFramebufferEXT(GLenum target, GLuint framebuffer) {
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TRACE();
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if(framebuffer) {
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ACTIVE_FRAMEBUFFER = (FrameBuffer*) named_array_get(&FRAMEBUFFERS, framebuffer);
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} else {
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ACTIVE_FRAMEBUFFER = NULL;
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/* FIXME: This is where we need to submit the lists and then clear them. Binding zero means returning to the
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* default framebuffer so we need to render a frame to the texture at that point */
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}
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}
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void APIENTRY glFramebufferTexture2DEXT(GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level) {
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if(texture != 0 && !glIsTexture(texture)) {
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_glKosThrowError(GL_INVALID_OPERATION, __func__);
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_glKosPrintError();
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return;
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}
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if(!ACTIVE_FRAMEBUFFER) {
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_glKosThrowError(GL_INVALID_OPERATION, __func__);
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_glKosPrintError();
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return;
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}
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ACTIVE_FRAMEBUFFER->texture_id = texture;
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}
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static inline GLuint A1555(GLuint v) {
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const GLuint MASK = (1 << 15);
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return (v & MASK) >> 15;
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}
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static inline GLuint R1555(GLuint v) {
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const GLuint MASK = (31 << 10);
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return (v & MASK) >> 10;
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}
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static inline GLuint G1555(GLuint v) {
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const GLuint MASK = (31 << 5);
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return (v & MASK) >> 5;
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}
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static inline GLuint B1555(GLuint v) {
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const GLuint MASK = (31 << 0);
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return (v & MASK) >> 0;
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}
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static inline GLuint A4444(GLuint v) {
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const GLuint MASK = (0xF << 12);
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return (v & MASK) >> 12;
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}
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static inline GLuint R4444(GLuint v) {
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const GLuint MASK = (0xF << 8);
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return (v & MASK) >> 8;
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}
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static inline GLuint G4444(GLuint v) {
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const GLuint MASK = (0xF << 4);
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return (v & MASK) >> 4;
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}
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static inline GLuint B4444(GLuint v) {
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const GLuint MASK = (0xF << 0);
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return (v & MASK) >> 0;
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}
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static inline GLuint R565(GLuint v) {
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const GLuint MASK = (31 << 11);
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return (v & MASK) >> 11;
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}
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static inline GLuint G565(GLuint v) {
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const GLuint MASK = (63 << 5);
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return (v & MASK) >> 5;
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}
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static inline GLuint B565(GLuint v) {
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const GLuint MASK = (31 << 0);
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return (v & MASK) >> 0;
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}
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GLboolean _glCalculateAverageTexel(const GLubyte* src, const GLuint srcWidth, const GLuint pvrFormat, GLubyte* dest) {
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GLushort* s1 = ((GLushort*) src);
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GLushort* s2 = ((GLushort*) src) + 1;
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GLushort* s3 = ((GLushort*) src) + srcWidth;
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GLushort* s4 = ((GLushort*) src) + srcWidth + 1;
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GLushort* d1 = ((GLushort*) dest);
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GLuint a, r, g, b;
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if((pvrFormat & PVR_TXRFMT_ARGB1555) == PVR_TXRFMT_ARGB1555) {
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a = A1555(*s1) + A1555(*s2) + A1555(*s3) + A1555(*s4);
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r = R1555(*s1) + R1555(*s2) + R1555(*s3) + R1555(*s4);
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g = G1555(*s1) + R1555(*s2) + R1555(*s3) + R1555(*s4);
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b = B1555(*s1) + R1555(*s2) + R1555(*s3) + R1555(*s4);
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a /= 4;
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r /= 4;
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g /= 4;
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b /= 4;
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*d1 = (a << 15 | r << 10 | g << 5 | b);
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} else if((pvrFormat & PVR_TXRFMT_ARGB4444) == PVR_TXRFMT_ARGB4444) {
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a = A4444(*s1) + A4444(*s2) + A4444(*s3) + A4444(*s4);
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r = R4444(*s1) + R4444(*s2) + R4444(*s3) + R4444(*s4);
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g = G4444(*s1) + R4444(*s2) + R4444(*s3) + R4444(*s4);
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b = B4444(*s1) + R4444(*s2) + R4444(*s3) + R4444(*s4);
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a /= 4;
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r /= 4;
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g /= 4;
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b /= 4;
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*d1 = (a << 12 | r << 8 | g << 4 | b);
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} else if((pvrFormat & PVR_TXRFMT_RGB565) == PVR_TXRFMT_ARGB4444) {
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r = R565(*s1) + R565(*s2) + R565(*s3) + R565(*s4);
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g = G565(*s1) + R565(*s2) + R565(*s3) + R565(*s4);
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b = B565(*s1) + R565(*s2) + R565(*s3) + R565(*s4);
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r /= 4;
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g /= 4;
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b /= 4;
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*d1 = (r << 11 | g << 5 | b);
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} else {
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fprintf(stderr, "ERROR: Unsupported PVR format for mipmap generation");
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_glKosThrowError(GL_INVALID_OPERATION, "glGenerateMipmapEXT");
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_glKosPrintError();
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return GL_FALSE;
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}
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return GL_TRUE;
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}
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void APIENTRY glGenerateMipmapEXT(GLenum target) {
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if(target != GL_TEXTURE_2D) {
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_glKosThrowError(GL_INVALID_OPERATION, __func__);
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_glKosPrintError();
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return;
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}
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TextureObject* tex = _glGetBoundTexture();
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if(!tex || !tex->data || !tex->mipmapCount) {
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_glKosThrowError(GL_INVALID_OPERATION, __func__);
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_glKosPrintError();
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return;
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}
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if(_glIsMipmapComplete(tex)) {
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/* Nothing to do */
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return;
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}
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GLuint i = 1;
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GLuint sx, sy, dx, dy;
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GLuint prevWidth = tex->width;
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GLuint prevHeight = tex->height;
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for(; i < _glGetMipmapLevelCount(tex); ++i) {
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GLubyte* prevData = _glGetMipmapLocation(tex, i - 1);
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GLubyte* thisData = _glGetMipmapLocation(tex, i);
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GLuint thisWidth = (prevWidth > 1) ? prevWidth / 2 : 1;
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GLuint thisHeight = (prevHeight > 1) ? prevHeight / 2 : 1;
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/* Do the minification */
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for(sx = 0, dx = 0; sx < prevWidth; sx += 2, dx += 1) {
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for(sy = 0, dy = 0; sy < prevHeight; sy += 2, dy += 1) {
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GLubyte* srcTexel = &prevData[
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((sy * prevWidth) + sx) * tex->dataStride
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];
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GLubyte* destTexel = &thisData[
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((dy * thisWidth) + dx) * tex->dataStride
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];
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if(!_glCalculateAverageTexel(
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srcTexel,
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prevWidth,
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tex->color,
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destTexel
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)) {
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return;
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}
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}
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}
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tex->mipmap |= (1 << i);
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prevWidth = thisWidth;
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prevHeight = thisHeight;
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}
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}
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GLenum APIENTRY glCheckFramebufferStatusEXT(GLenum target) {
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if(target != GL_FRAMEBUFFER_EXT) {
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_glKosThrowError(GL_INVALID_ENUM, __func__);
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_glKosPrintError();
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return 0;
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}
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if(!ACTIVE_FRAMEBUFFER) {
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return GL_FRAMEBUFFER_COMPLETE_EXT;
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}
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if(!ACTIVE_FRAMEBUFFER->texture_id) {
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return GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT;
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}
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return GL_FRAMEBUFFER_COMPLETE_EXT;
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}
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GLboolean APIENTRY glIsFramebufferEXT(GLuint framebuffer) {
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return (named_array_used(&FRAMEBUFFERS, framebuffer)) ? GL_TRUE : GL_FALSE;
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}
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