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Make sure we clamp floating point colours to avoid overflows

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This commit is contained in:
Luke Benstead 2019-09-04 17:58:55 +01:00
parent 041b545177
commit 8e59b9adb5
1 changed files with 13 additions and 8 deletions
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21
GL/draw.c
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@ -74,6 +74,11 @@ typedef void (*ByteParseFunc)(GLubyte* out, const GLubyte* in);
typedef void (*PolyBuildFunc)(Vertex* first, Vertex* previous, Vertex* vertex, Vertex* next, const GLsizei i);
static inline float clamp(float d, float min, float max) {
const float t = d < min ? min : d;
return t > max ? max : t;
}
static void _readVertexData3f3f(const float* input, GLuint count, GLubyte stride, float* output) {
ITERATE(count) {
output[0] = input[0];
@ -306,21 +311,21 @@ static void _readVertexData4ubARGB(const GLubyte* input, GLuint count, GLubyte s
static void _readVertexData4fARGB(const float* input, GLuint count, GLubyte stride, GLubyte* output) {
ITERATE(count) {
output[R8IDX] = (GLubyte) (input[0] * 255.0f);
output[G8IDX] = (GLubyte) (input[1] * 255.0f);
output[B8IDX] = (GLubyte) (input[2] * 255.0f);
output[A8IDX] = (GLubyte) (input[3] * 255.0f);
output[R8IDX] = (GLubyte) clamp(input[0] * 255.0f, 0, 255);
output[G8IDX] = (GLubyte) clamp(input[1] * 255.0f, 0, 255);
output[B8IDX] = (GLubyte) clamp(input[2] * 255.0f, 0, 255);
output[A8IDX] = (GLubyte) clamp(input[3] * 255.0f, 0, 255);
input = (float*) (((GLubyte*) input) + stride);
output = (GLubyte*) (((GLubyte*) output) + sizeof(Vertex));
output += sizeof(Vertex);
}
}
static void _readVertexData3fARGB(const float* input, GLuint count, GLubyte stride, GLubyte* output) {
ITERATE(count) {
output[R8IDX] = (GLubyte) (input[0] * 255.0f);
output[G8IDX] = (GLubyte) (input[1] * 255.0f);
output[B8IDX] = (GLubyte) (input[2] * 255.0f);
output[R8IDX] = (GLubyte) clamp(input[0] * 255.0f, 0, 255);
output[G8IDX] = (GLubyte) clamp(input[1] * 255.0f, 0, 255);
output[B8IDX] = (GLubyte) clamp(input[2] * 255.0f, 0, 255);
output[A8IDX] = 1.0f;
input = (float*) (((GLubyte*) input) + stride);