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Improved mipmaps support and image loading

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raysan5
2015-07-05 18:21:01 +02:00
parent 84befaea24
commit c944d62374
5 changed files with 413 additions and 227 deletions
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174
src/rlgl.c
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@@ -221,7 +221,7 @@ static bool vaoSupported = false; // VAO support (OpenGL ES2 could not support
static bool npotSupported = false; // NPOT textures full support
// Compressed textures support flags
static bool texCompDXTSupported = false; // DDS texture compression support
//static bool texCompDXTSupported = false; // DDS texture compression support
static bool texCompETC1Supported = false; // ETC1 texture compression support
static bool texCompETC2Supported = false; // ETC2/EAC texture compression support
static bool texCompPVRTSupported = false; // PVR texture compression support
@@ -232,6 +232,9 @@ static GLuint fbo, fboColorTexture, fboDepthTexture;
static Model postproQuad;
#endif
// Compressed textures support flags
static bool texCompDXTSupported = false; // DDS texture compression support
#if defined(GRAPHICS_API_OPENGL_ES2)
// NOTE: VAO functionality is exposed through extensions (OES)
static PFNGLGENVERTEXARRAYSOESPROC glGenVertexArrays;
@@ -263,7 +266,9 @@ static int GenerateMipmaps(unsigned char *data, int baseWidth, int baseHeight);
static pixel *GenNextMipmap(pixel *srcData, int srcWidth, int srcHeight);
#endif
#if defined(GRAPHICS_API_OPENGL_ES2)
static char** StringSplit(char *baseString, const char delimiter, int *numExt);
#endif
//----------------------------------------------------------------------------------
// Module Functions Definition - Matrix operations
@@ -967,7 +972,7 @@ void rlglInit(void)
// Create default white texture for plain colors (required by shader)
unsigned char pixels[4] = { 255, 255, 255, 255 }; // 1 pixel RGBA (4 bytes)
whiteTexture = rlglLoadTexture(pixels, 1, 1, UNCOMPRESSED_R8G8B8A8, 1, false);
whiteTexture = rlglLoadTexture(pixels, 1, 1, UNCOMPRESSED_R8G8B8A8, 1);
if (whiteTexture != 0) TraceLog(INFO, "[TEX ID %i] Base white texture loaded successfully", whiteTexture);
else TraceLog(WARNING, "Base white texture could not be loaded");
@@ -1623,7 +1628,7 @@ Vector3 rlglUnproject(Vector3 source, Matrix proj, Matrix view)
}
// Convert image data to OpenGL texture (returns OpenGL valid Id)
unsigned int rlglLoadTexture(void *data, int width, int height, int textureFormat, int mipmapCount, bool genMipmaps)
unsigned int rlglLoadTexture(void *data, int width, int height, int textureFormat, int mipmapCount)
{
glBindTexture(GL_TEXTURE_2D, 0); // Free any old binding
@@ -1642,7 +1647,7 @@ unsigned int rlglLoadTexture(void *data, int width, int height, int textureForma
TraceLog(WARNING, "DXT compressed texture format not supported");
return id;
}
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
if ((!texCompETC1Supported) && (textureFormat == COMPRESSED_ETC1_RGB))
{
TraceLog(WARNING, "ETC1 compressed texture format not supported");
@@ -1666,7 +1671,8 @@ unsigned int rlglLoadTexture(void *data, int width, int height, int textureForma
TraceLog(WARNING, "ASTC compressed texture format not supported");
return id;
}
#endif
glGenTextures(1, &id); // Generate Pointer to the texture
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
@@ -1755,23 +1761,63 @@ unsigned int rlglLoadTexture(void *data, int width, int height, int textureForma
}
#endif
// Texture parameters configuration
// NOTE: glTexParameteri does NOT affect texture uploading, just the way it's used
#if defined(GRAPHICS_API_OPENGL_ES2)
// NOTE: OpenGL ES 2.0 with no GL_OES_texture_npot support (i.e. WebGL) has limited NPOT support, so CLAMP_TO_EDGE must be used
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); // Set texture to clamp on x-axis
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); // Set texture to clamp on y-axis
#else
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); // Set texture to repeat on x-axis
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); // Set texture to repeat on y-axis
#endif
// Magnification and minification filters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); // Filter for pixel-perfect drawing, alternative: GL_LINEAR
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); // Filter for pixel-perfect drawing, alternative: GL_LINEAR
#if defined(GRAPHICS_API_OPENGL_33)
if (mipmapCount > 1)
{
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); // Activate Trilinear filtering for mipmaps (must be available)
}
#endif
// At this point we have the texture loaded in GPU and texture parameters configured
// NOTE: If mipmaps were not in data, they are not generated automatically
// Unbind current texture
glBindTexture(GL_TEXTURE_2D, 0);
if (id > 0) TraceLog(INFO, "[TEX ID %i] Texture created successfully (%ix%i)", id, width, height);
else TraceLog(WARNING, "Texture could not be created");
return id;
}
// Generate mipmap data for selected texture
void rlglGenerateMipmaps(unsigned int textureId)
{
glBindTexture(GL_TEXTURE_2D, textureId);
int width, height;
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height);
// Check if texture is power-of-two (POT) to enable mipmap generation
bool texIsPOT = false;
if (((width > 0) && ((width & (width - 1)) == 0)) && ((height > 0) && ((height & (height - 1)) == 0))) texIsPOT = true;
if (genMipmaps && !texIsPOT)
if (texIsPOT)
{
TraceLog(WARNING, "[TEX ID %i] Texture is not power-of-two, mipmaps can not be generated", id);
genMipmaps = false;
}
// Generate mipmaps if required
// TODO: Improve mipmaps support
#if defined(GRAPHICS_API_OPENGL_11)
if (genMipmaps)
{
// Compute required mipmaps
void *data = rlglReadTexturePixels(textureId, UNCOMPRESSED_R8G8B8A8); // TODO: Detect internal format
// NOTE: data size is reallocated to fit mipmaps data
int mipmapCount = GenerateMipmaps(data, width, height);
@@ -1794,48 +1840,21 @@ unsigned int rlglLoadTexture(void *data, int width, int height, int textureForma
mipHeight /= 2;
}
TraceLog(WARNING, "[TEX ID %i] Mipmaps generated manually on CPU side", id);
}
TraceLog(WARNING, "[TEX ID %i] Mipmaps generated manually on CPU side", textureId);
#elif defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
if ((mipmapCount == 1) && (genMipmaps))
{
glGenerateMipmap(GL_TEXTURE_2D); // Generate mipmaps automatically
TraceLog(INFO, "[TEX ID %i] Mipmaps generated automatically for new texture", id);
}
glGenerateMipmap(GL_TEXTURE_2D); // Generate mipmaps automatically
TraceLog(INFO, "[TEX ID %i] Mipmaps generated automatically", textureId);
#endif
// Texture parameters configuration
// NOTE: glTexParameteri does NOT affect texture uploading, just the way it's used
#if defined(GRAPHICS_API_OPENGL_ES2)
// NOTE: OpenGL ES 2.0 with no GL_OES_texture_npot support (i.e. WebGL) has limited NPOT support, so CLAMP_TO_EDGE must be used
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); // Set texture to clamp on x-axis
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); // Set texture to clamp on y-axis
#else
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); // Set texture to repeat on x-axis
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); // Set texture to repeat on y-axis
#endif
// Magnification and minification filters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); // Filter for pixel-perfect drawing, alternative: GL_LINEAR
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); // Filter for pixel-perfect drawing, alternative: GL_LINEAR
#if defined(GRAPHICS_API_OPENGL_33)
if ((mipmapCount > 1) || (genMipmaps))
{
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); // Activate Trilinear filtering for mipmaps (must be available)
}
#endif
// At this point we have the texture loaded in GPU, with mipmaps generated (if desired) and texture parameters configured
// Unbind current texture
}
else TraceLog(WARNING, "[TEX ID %i] Texture is not power-of-two, mipmaps can not be generated", textureId);
glBindTexture(GL_TEXTURE_2D, 0);
if (id > 0) TraceLog(INFO, "[TEX ID %i] Texture created successfully (%ix%i)", id, width, height);
else TraceLog(WARNING, "Texture could not be created");
return id;
}
// Load vertex data into a VAO (if supported) and VBO
@@ -2039,6 +2058,47 @@ unsigned char *rlglReadScreenPixels(int width, int height)
return imgData; // NOTE: image data should be freed
}
// Read texture pixel data
void *rlglReadTexturePixels(unsigned int textureId, unsigned int format)
{
int width, height;
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height);
//glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_INTERNAL_FORMAT, &format);
//GL_TEXTURE_RED_SIZE, GL_TEXTURE_GREEN_SIZE, GL_TEXTURE_BLUE_SIZE, GL_TEXTURE_ALPHA_SIZE
int glFormat, glType;
void *pixels = NULL;
unsigned int size = width*height;
switch (format)
{
case UNCOMPRESSED_GRAYSCALE: pixels = (unsigned char *)malloc(size); glFormat = GL_LUMINANCE; glType = GL_UNSIGNED_BYTE; // 8 bit per pixel (no alpha)
case UNCOMPRESSED_GRAY_ALPHA: pixels = (unsigned char *)malloc(size*2); glFormat = GL_LUMINANCE_ALPHA; glType = GL_UNSIGNED_BYTE; // 16 bpp (2 channels)
case UNCOMPRESSED_R5G6B5: pixels = (unsigned short *)malloc(size); glFormat = GL_RGB; glType = GL_UNSIGNED_SHORT_5_6_5; // 16 bpp
case UNCOMPRESSED_R8G8B8: pixels = (unsigned char *)malloc(size*3); glFormat = GL_RGB; glType = GL_UNSIGNED_BYTE; // 24 bpp
case UNCOMPRESSED_R5G5B5A1: pixels = (unsigned short *)malloc(size); glFormat = GL_RGBA; glType = GL_UNSIGNED_SHORT_5_5_5_1; // 16 bpp (1 bit alpha)
case UNCOMPRESSED_R4G4B4A4: pixels = (unsigned short *)malloc(size); glFormat = GL_RGBA; glType = GL_UNSIGNED_SHORT_4_4_4_4; // 16 bpp (4 bit alpha)
case UNCOMPRESSED_R8G8B8A8: pixels = (unsigned char *)malloc(size*4); glFormat = GL_RGBA; glType = GL_UNSIGNED_BYTE; // 32 bpp
default: TraceLog(WARNING, "Texture format not suported"); break;
}
glBindTexture(GL_TEXTURE_2D, textureId);
// NOTE: Each row written to or read from by OpenGL pixel operations like glGetTexImage are aligned to a 4 byte boundary by default, which may add some padding.
// Use glPixelStorei to modify padding with the GL_[UN]PACK_ALIGNMENT setting.
// GL_PACK_ALIGNMENT affects operations that read from OpenGL memory (glReadPixels, glGetTexImage, etc.)
// GL_UNPACK_ALIGNMENT affects operations that write to OpenGL memory (glTexImage, etc.)
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glGetTexImage(GL_TEXTURE_2D, 0, glFormat, glType, pixels);
glBindTexture(GL_TEXTURE_2D, 0);
return pixels;
}
// Load a shader (vertex shader + fragment shader) from files
Shader rlglLoadShader(char *vsFileName, char *fsFileName)
{
@@ -2159,15 +2219,18 @@ void rlglSetDefaultShader(void)
int GetShaderLocation(Shader shader, const char *uniformName)
{
int location = glGetUniformLocation(shader.id, uniformName);
int location = -1;
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
location = glGetUniformLocation(shader.id, uniformName);
if (location == -1) TraceLog(WARNING, "[SHDR ID %i] Shader location for %s could not be found", shader.id, uniformName);
#endif
return location;
}
void SetShaderValue(Shader shader, int uniformLoc, float *value, int size)
{
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
glUseProgram(shader.id);
if (size == 1) glUniform1fv(uniformLoc, 1, value); // Shader uniform type: float
@@ -2177,10 +2240,12 @@ void SetShaderValue(Shader shader, int uniformLoc, float *value, int size)
else TraceLog(WARNING, "Shader value float array size not recognized");
glUseProgram(0);
#endif
}
void SetShaderMapDiffuse(Shader *shader, Texture2D texture)
{
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
shader->texDiffuseId = texture.id;
glUseProgram(shader->id);
@@ -2193,10 +2258,12 @@ void SetShaderMapDiffuse(Shader *shader, Texture2D texture)
glBindTexture(GL_TEXTURE_2D, 0);
glActiveTexture(GL_TEXTURE0);
glUseProgram(0);
#endif
}
void SetShaderMapNormal(Shader *shader, const char *uniformName, Texture2D texture)
{
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
shader->mapNormalLoc = glGetUniformLocation(shader->id, uniformName);
if (shader->mapNormalLoc == -1) TraceLog(WARNING, "[SHDR ID %i] Shader location for %s could not be found", shader->id, uniformName);
@@ -2215,10 +2282,12 @@ void SetShaderMapNormal(Shader *shader, const char *uniformName, Texture2D textu
glActiveTexture(GL_TEXTURE0);
glUseProgram(0);
}
#endif
}
void SetShaderMapSpecular(Shader *shader, const char *uniformName, Texture2D texture)
{
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
shader->mapSpecularLoc = glGetUniformLocation(shader->id, uniformName);
if (shader->mapSpecularLoc == -1) TraceLog(WARNING, "[SHDR ID %i] Shader location for %s could not be found", shader->id, uniformName);
@@ -2237,6 +2306,7 @@ void SetShaderMapSpecular(Shader *shader, const char *uniformName, Texture2D tex
glActiveTexture(GL_TEXTURE0);
glUseProgram(0);
}
#endif
}
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
@@ -2865,6 +2935,7 @@ void TraceLog(int msgType, const char *text, ...)
}
#endif
#if defined(GRAPHICS_API_OPENGL_ES2)
static char **StringSplit(char *baseString, const char delimiter, int *numExt)
{
char **result = 0;
@@ -2913,4 +2984,5 @@ static char **StringSplit(char *baseString, const char delimiter, int *numExt)
*numExt = (count - 1);
return result;
}
}
#endif