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rlDrawMeshInstanced GetShaderAttribLocation; comments

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This commit is contained in:
Sean Pringle 2020-07-21 09:36:22 +10:00
parent f767771b4f
commit 98c401d747
2 changed files with 33 additions and 25 deletions
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1
src/raylib.h
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@ -1364,6 +1364,7 @@ RLAPI void SetShapesTexture(Texture2D texture, Rectangle source); // Def
// Shader configuration functions
RLAPI int GetShaderLocation(Shader shader, const char *uniformName); // Get shader uniform location
RLAPI int GetShaderAttribLocation(Shader shader, const char *attribName); // Get shader attribute location
RLAPI void SetShaderValue(Shader shader, int uniformLoc, const void *value, int uniformType); // Set shader uniform value
RLAPI void SetShaderValueV(Shader shader, int uniformLoc, const void *value, int uniformType, int count); // Set shader uniform value vector
RLAPI void SetShaderValueMatrix(Shader shader, int uniformLoc, Matrix mat); // Set shader uniform value (matrix 4x4)

57
src/rlgl.h
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@ -571,6 +571,7 @@ RLAPI Rectangle GetShapesTextureRec(void); // Get
// Shader configuration functions
RLAPI int GetShaderLocation(Shader shader, const char *uniformName); // Get shader uniform location
RLAPI int GetShaderAttribLocation(Shader shader, const char *attribName); // Get shader attribute location
RLAPI void SetShaderValue(Shader shader, int uniformLoc, const void *value, int uniformType); // Set shader uniform value
RLAPI void SetShaderValueV(Shader shader, int uniformLoc, const void *value, int uniformType, int count); // Set shader uniform value vector
RLAPI void SetShaderValueMatrix(Shader shader, int uniformLoc, Matrix mat); // Set shader uniform value (matrix 4x4)
@ -2846,9 +2847,6 @@ void rlDrawMeshInstanced(Mesh mesh, Material material, int count, Matrix *transf
// Bind shader program
glUseProgram(material.shader.id);
// Matrices and other values required by shader
//-----------------------------------------------------
// Upload to shader material.colDiffuse
if (material.shader.locs[LOC_COLOR_DIFFUSE] != -1)
glUniform4f(material.shader.locs[LOC_COLOR_DIFFUSE], (float)material.maps[MAP_DIFFUSE].color.r/255.0f,
@ -2863,15 +2861,14 @@ void rlDrawMeshInstanced(Mesh mesh, Material material, int count, Matrix *transf
(float)material.maps[MAP_SPECULAR].color.b/255.0f,
(float)material.maps[MAP_SPECULAR].color.a/255.0f);
//-----------------------------------------------------
// Bind active texture maps (if available)
for (int i = 0; i < MAX_MATERIAL_MAPS; i++)
{
if (material.maps[i].texture.id > 0)
{
glActiveTexture(GL_TEXTURE0 + i);
if ((i == MAP_IRRADIANCE) || (i == MAP_PREFILTER) || (i == MAP_CUBEMAP)) glBindTexture(GL_TEXTURE_CUBE_MAP, material.maps[i].texture.id);
if ((i == MAP_IRRADIANCE) || (i == MAP_PREFILTER) || (i == MAP_CUBEMAP))
glBindTexture(GL_TEXTURE_CUBE_MAP, material.maps[i].texture.id);
else glBindTexture(GL_TEXTURE_2D, material.maps[i].texture.id);
glUniform1i(material.shader.locs[LOC_MAP_DIFFUSE + i], i);
@ -2882,29 +2879,31 @@ void rlDrawMeshInstanced(Mesh mesh, Material material, int count, Matrix *transf
glBindVertexArray(mesh.vaoId);
// At this point the modelview matrix just contains the view matrix (camera)
// That's because BeginMode3D() sets it an no model-drawing function modifies it, all use rlPushMatrix() and rlPopMatrix()
Matrix matView = RLGL.State.modelview; // View matrix (camera)
Matrix matProjection = RLGL.State.projection; // Projection matrix (perspective)
// For instanced shaders "mvp" is not premultiplied by any instance transform, only RLGL.State.transform
glUniformMatrix4fv(material.shader.locs[LOC_MATRIX_MVP], 1, false, MatrixToFloat(
MatrixMultiply(MatrixMultiply(RLGL.State.transform, RLGL.State.modelview), RLGL.State.projection)
));
SetShaderValueMatrix(material.shader, material.shader.locs[LOC_MATRIX_MODEL], RLGL.State.transform);
SetShaderValueMatrix(material.shader, material.shader.locs[LOC_MATRIX_VIEW], RLGL.State.modelview);
SetShaderValueMatrix(material.shader, material.shader.locs[LOC_MATRIX_PROJECTION], RLGL.State.projection);
float16* instances = RL_MALLOC(count * sizeof(float16));
float16* instances = calloc(count, sizeof(float16));
for (int i = 0; i < count; i++) {
for (int i = 0; i < count; i++)
instances[i] = MatrixToFloatV(transforms[i]);
}
// This could alternatively use a static VBO and either glMapBuffer or glBufferSubData.
// It isn't clear which would be reliably faster in all cases and on all platforms, and
// anecdotally glMapBuffer seems very slow (syncs) while glBufferSubData seems no faster
// since we're transferring all the transform matrices anyway.
unsigned int instancesB;
glGenBuffers(1, &instancesB);
glBindBuffer(GL_ARRAY_BUFFER, instancesB);
glBufferData(GL_ARRAY_BUFFER, count * sizeof(float16), instances, GL_STATIC_DRAW);
unsigned int instanceA = glGetAttribLocation(material.shader.id, "instance");
// Instances are put in LOC_MATRIX_MODEL attribute location with space for 4x Vector4, eg:
// layout (location = 12) in mat4 instance;
unsigned int instanceA = material.shader.locs[LOC_MATRIX_MODEL];
// Set attribute pointers for matrix (4 times sizeof Vector4).
for (unsigned int i = 0; i < 4; i++) {
for (unsigned int i = 0; i < 4; i++)
{
glEnableVertexAttribArray(instanceA+i);
glVertexAttribPointer(instanceA+i, 4, GL_FLOAT, GL_FALSE, sizeof(Matrix), (void*)(i * sizeof(Vector4)));
glVertexAttribDivisor(instanceA+i, 1);
@ -2921,7 +2920,7 @@ void rlDrawMeshInstanced(Mesh mesh, Material material, int count, Matrix *transf
}
glDeleteBuffers(1, &instancesB);
free(instances);
RL_FREE(instances);
// Unbind all binded texture maps
for (int i = 0; i < MAX_MATERIAL_MAPS; i++)
@ -2937,11 +2936,6 @@ void rlDrawMeshInstanced(Mesh mesh, Material material, int count, Matrix *transf
// Unbind shader program
glUseProgram(0);
// Restore RLGL.State.projection/RLGL.State.modelview matrices
// NOTE: In stereo rendering matrices are being modified to fit every eye
RLGL.State.projection = matProjection;
RLGL.State.modelview = matView;
#else
TRACELOG(LOG_ERROR, "VAO: Instanced rendering requires GRAPHICS_API_OPENGL_33");
#endif
@ -3259,6 +3253,19 @@ int GetShaderLocation(Shader shader, const char *uniformName)
return location;
}
// Get shader attribute location
int GetShaderAttribLocation(Shader shader, const char *attribName)
{
int location = -1;
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
location = glGetAttribLocation(shader.id, attribName);
if (location == -1) TRACELOG(LOG_WARNING, "SHADER: [ID %i] Failed to find shader attribute: %s", shader.id, attribName);
else TRACELOG(LOG_INFO, "SHADER: [ID %i] Shader attribute (%s) set at location: %i", shader.id, attribName, location);
#endif
return location;
}
// Set shader uniform value
void SetShaderValue(Shader shader, int uniformLoc, const void *value, int uniformType)
{