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[Feat](drawing): draw indirect impl

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This commit is contained in:
Swung0x48 2025-03-01 23:30:22 +08:00
parent 40709ce56d
commit 03948b6c52
3 changed files with 68 additions and 7 deletions
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59
src/main/cpp/gl/drawing.cpp
View File

@ -8,17 +8,68 @@
#define DEBUG 0
static bool g_indirect_cmds_inited = false;
std::vector<draw_elements_indirect_command_t> g_commands;
GLuint g_indirectbuffer = 0;
void glMultiDrawElementsBaseVertex(GLenum mode, GLsizei* counts, GLenum type, const void* const* indices, GLsizei primcount, const GLint* basevertex) {
LOG()
LOAD_GLES_FUNC(glDrawElementsBaseVertex)
// LOAD_GLES_FUNC(glDrawElementsBaseVertex)
//
// for (GLsizei i = 0; i < primcount; ++i) {
// const GLsizei count = counts[i];
// if (count > 0) {
// gles_glDrawElementsBaseVertex(mode, count, type, indices[i], basevertex[i]);
// }
// }
if (!g_indirect_cmds_inited) {
GLES.glGenBuffers(1, &g_indirectbuffer);
GLES.glBindBuffer(GL_DRAW_INDIRECT_BUFFER, g_indirectbuffer);
g_commands.resize(1);
g_indirect_cmds_inited = true;
}
if (g_commands.size() < primcount) {
size_t sz = g_commands.size();
LOG_D("Before resize: %d", sz)
// 2-exponential to reduce reallocation
while (sz < primcount)
sz *= 2;
g_commands.resize(sz);
GLES.glBufferData(GL_DRAW_INDIRECT_BUFFER,
sz * sizeof(draw_elements_indirect_command_t), NULL, GL_DYNAMIC_DRAW);
}
LOG_D("After resize: %d", g_commands.size())
for (GLsizei i = 0; i < primcount; ++i) {
const GLsizei count = counts[i];
if (count > 0) {
gles_glDrawElementsBaseVertex(mode, count, type, indices[i], basevertex[i]);
g_commands[i].count = counts[i];
g_commands[i].instanceCount = 1;
g_commands[i].firstIndex = static_cast<GLuint>(reinterpret_cast<uintptr_t>(indices[i]));
g_commands[i].baseVertex = basevertex[i];
g_commands[i].reservedMustBeZero = 0;
}
void* pcmds = GLES.glMapBufferRange(GL_DRAW_INDIRECT_BUFFER,
0, primcount * sizeof(draw_elements_indirect_command_t),
GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT);
memcpy(pcmds, g_commands.data(), primcount * sizeof(draw_elements_indirect_command_t));
GLES.glUnmapBuffer(GL_DRAW_INDIRECT_BUFFER);
// Draw indirect!
for (GLsizei i = 0; i < primcount; ++i) {
const GLvoid* offset = reinterpret_cast<GLvoid*>(i * sizeof(draw_elements_indirect_command_t));
GLES.glDrawElementsIndirect(mode, type, offset);
}
CHECK_GL_ERROR
}
void glMultiDrawElements(GLenum mode, const GLsizei* count, GLenum type, const void* const* indices, GLsizei primcount) {

8
src/main/cpp/gl/drawing.h
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@ -21,6 +21,14 @@
extern "C" {
#endif
struct draw_elements_indirect_command_t {
GLuint count;
GLuint instanceCount;
GLuint firstIndex;
GLint baseVertex;
GLuint reservedMustBeZero;
};
GLAPI GLAPIENTRY void glMultiDrawElementsBaseVertex(GLenum mode, GLsizei *counts, GLenum type, const void *const *indices, GLsizei primcount, const GLint *basevertex);
GLAPI GLAPIENTRY void glMultiDrawElements(GLenum mode, const GLsizei *count, GLenum type, const void *const *indices, GLsizei primcount);

2
src/main/cpp/gles/gles.h
View File

@ -896,6 +896,8 @@ struct gles_func_t {
extern struct gles_func_t g_gles_func;
#define GLES g_gles_func
#ifdef __cplusplus
}
#endif