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OpenGL 1.0 fallback attempt

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This commit is contained in:
UnknownShadow200 2024-06-06 22:49:47 +10:00
parent 14f3b610e8
commit 343bd7413a
3 changed files with 73 additions and 10 deletions
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58
src/Graphics_GL1.c
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@ -654,6 +654,51 @@ static void APIENTRY legacy_bufferSubData(GLenum target, cc_uintptr offset, cc_u
}
static void APIENTRY gl10_bindTexture(GLenum target, GLuint texture) {
}
static void APIENTRY gl10_deleteTexture(GLsizei n, const GLuint* textures) {
}
static void APIENTRY gl10_genTexture(GLsizei n, GLuint* textures) {
}
static void APIENTRY gl10_texImage(GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const GLvoid* pixels) {
}
static void APIENTRY gl10_texSubImage(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid* pixels) {
}
static cc_uint8* gl10_vb;
static void APIENTRY gl10_drawElements(GLenum mode, GLsizei count, GLenum type, const GLvoid* indices) {
/* TODO */
int i;
glBegin(GL_QUADS);
if (gfx_format == VERTEX_FORMAT_TEXTURED) {
struct VertexTextured* src = (struct VertexTextured*)gl10_vb;
for (i = 0; i < count; i++, src++) {
glVertex3f(src->x, src->y, src->z);
}
} else {
struct VertexColoured* src = (struct VertexColoured*)gl10_vb;
for (i = 0; i < count; i++, src++) {
glVertex3f(src->x, src->y, src->z);
}
}
glEnd();
}
static void APIENTRY gl10_colorPointer(GLint size, GLenum type, GLsizei stride, GLpointer offset) {
}
static void APIENTRY gl10_texCoordPointer(GLint size, GLenum type, GLsizei stride, GLpointer offset) {
}
static void APIENTRY gl10_vertexPointer(GLint size, GLenum type, GLsizei stride, GLpointer offset) {
gl10_vb = cur_vb->data + offset;
}
static void APIENTRY gl11_drawElements(GLenum mode, GLsizei count, GLenum type, const GLvoid* indices) {
_realDrawElements(mode, count, type, (cc_uintptr)indices + cur_ib->data);
}
@ -686,6 +731,19 @@ static void FallbackOpenGL(void) {
_glDrawElements = gl11_drawElements; _glColorPointer = gl11_colorPointer;
_glTexCoordPointer = gl11_texCoordPointer; _glVertexPointer = gl11_vertexPointer;
/* OpenGL 1.0 fallback support */
if (_realDrawElements) return;
Window_ShowDialog("Performance warning", "OpenGL 1.0 only support, expect awful performance");
_glDrawElements = gl10_drawElements; _glColorPointer = gl10_colorPointer;
_glTexCoordPointer = gl10_texCoordPointer; _glVertexPointer = gl10_vertexPointer;
_glBindTexture = gl10_bindTexture;
_glGenTextures = gl10_genTexture;
_glDeleteTextures = gl10_deleteTexture;
_glTexImage2D = gl10_texImage;
_glTexSubImage2D = gl10_texSubImage;
}
#else
/* No point in even trying for other systems */

9
src/_GL1Funcs.h
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@ -48,9 +48,14 @@ GL_FUNC(void, glGetFloatv)(GLenum pname, GLfloat* params);
GL_FUNC(void, glGetIntegerv)(GLenum pname, GLint* params);
GL_FUNC(const GLubyte*, glGetString)(GLenum name);
/* Display list functions */
/* Legacy display list functions */
GL_FUNC(void, glCallList)(GLuint list);
GL_FUNC(void, glDeleteLists)(GLuint list, GLsizei range);
GL_FUNC(GLuint, glGenLists)(GLsizei range);
GL_FUNC(void, glNewList)(GLuint list, GLenum mode);
GL_FUNC(void, glEndList)(void);
GL_FUNC(void, glEndList)(void);
/* Legacy vertex draw functions */
GL_FUNC(void, glBegin)(GLenum mode);
GL_FUNC(void, glEnd)(void);
GL_FUNC(void, glVertex3f)(float x, float y, float z);

16
src/_GLShared.h
View File

@ -113,17 +113,17 @@ static CC_NOINLINE void UpdateTextureSlow(int x, int y, struct Bitmap* part, int
CopyTextureData(ptr, part->width << 2, part, rowWidth << 2);
if (full) {
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, part->width, part->height, 0, PIXEL_FORMAT, TRANSFER_FORMAT, ptr);
_glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, part->width, part->height, 0, PIXEL_FORMAT, TRANSFER_FORMAT, ptr);
} else {
glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, part->width, part->height, PIXEL_FORMAT, TRANSFER_FORMAT, ptr);
_glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, part->width, part->height, PIXEL_FORMAT, TRANSFER_FORMAT, ptr);
}
if (count > UPDATE_FAST_SIZE) Mem_Free(ptr);
}
static GfxResourceID Gfx_AllocTexture(struct Bitmap* bmp, int rowWidth, cc_uint8 flags, cc_bool mipmaps) {
GLuint texId;
glGenTextures(1, &texId);
glBindTexture(GL_TEXTURE_2D, texId);
GfxResourceID texId = NULL;
_glGenTextures(1, (GLuint*)&texId);
_glBindTexture(GL_TEXTURE_2D, ptr_to_uint(texId));
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
if (mipmaps) {
@ -143,11 +143,11 @@ static GfxResourceID Gfx_AllocTexture(struct Bitmap* bmp, int rowWidth, cc_uint8
}
if (mipmaps) Gfx_DoMipmaps(0, 0, bmp, rowWidth, false);
return uint_to_ptr(texId);
return texId;
}
void Gfx_UpdateTexture(GfxResourceID texId, int x, int y, struct Bitmap* part, int rowWidth, cc_bool mipmaps) {
glBindTexture(GL_TEXTURE_2D, ptr_to_uint(texId));
_glBindTexture(GL_TEXTURE_2D, ptr_to_uint(texId));
if (part->width == rowWidth) {
_glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, part->width, part->height, PIXEL_FORMAT, TRANSFER_FORMAT, part->scan0);
@ -160,7 +160,7 @@ void Gfx_UpdateTexture(GfxResourceID texId, int x, int y, struct Bitmap* part, i
void Gfx_DeleteTexture(GfxResourceID* texId) {
GLuint id = ptr_to_uint(*texId);
if (id) glDeleteTextures(1, &id);
if (id) _glDeleteTextures(1, &id);
*texId = 0;
}