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[rlgl] Add opt-in highp precision for default GLES shaders #5670

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[rlgl] Add opt-in highp precision for default GLES shaders #5670

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24 changes: 24 additions & 0 deletions src/rlgl.h
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Original file line number Diff line number Diff line change
Expand Up @@ -220,6 +220,14 @@
#define RL_DEFAULT_BATCH_MAX_TEXTURE_UNITS 4 // Maximum number of textures units that can be activated on batch drawing (SetShaderValueTexture())
#endif

#ifndef RLGL_ENABLE_GLES_DEFAULT_HIGHP_PRECISION
// Enable high precision floats in the default GLES shaders.
// Useful on some mobile GPUs/drivers where mediump causes visible 2D shape artifacts.
// Define RLGL_ENABLE_GLES_DEFAULT_HIGHP_PRECISION as 1 before including rlgl.h
// or pass it from the build system, e.g. -DRLGL_ENABLE_GLES_DEFAULT_HIGHP_PRECISION=1.
#define RLGL_ENABLE_GLES_DEFAULT_HIGHP_PRECISION 0
#endif

// Internal Matrix stack
#ifndef RL_MAX_MATRIX_STACK_SIZE
#define RL_MAX_MATRIX_STACK_SIZE 32 // Maximum size of Matrix stack
Expand Down Expand Up @@ -5011,15 +5019,23 @@ static void rlLoadShaderDefault(void)

#if defined(GRAPHICS_API_OPENGL_ES3)
"#version 300 es \n"
#if RLGL_ENABLE_GLES_DEFAULT_HIGHP_PRECISION
"precision highp float; \n" // Use high precision on GLES to reduce device-specific vertex/edge artifacts
#else
"precision mediump float; \n" // Precision required for OpenGL ES3 (WebGL 2) (on some browsers)
#endif
"in vec3 vertexPosition; \n"
"in vec2 vertexTexCoord; \n"
"in vec4 vertexColor; \n"
"out vec2 fragTexCoord; \n"
"out vec4 fragColor; \n"
#elif defined(GRAPHICS_API_OPENGL_ES2)
"#version 100 \n"
#if RLGL_ENABLE_GLES_DEFAULT_HIGHP_PRECISION
"precision highp float; \n" // Use high precision on GLES to reduce device-specific vertex/edge artifacts
#else
"precision mediump float; \n" // Precision required for OpenGL ES2 (WebGL) (on some browsers)
#endif
"attribute vec3 vertexPosition; \n"
"attribute vec2 vertexTexCoord; \n"
"attribute vec4 vertexColor; \n"
Expand Down Expand Up @@ -5064,7 +5080,11 @@ static void rlLoadShaderDefault(void)

#if defined(GRAPHICS_API_OPENGL_ES3)
"#version 300 es \n"
#if RLGL_ENABLE_GLES_DEFAULT_HIGHP_PRECISION
"precision highp float; \n" // Use high precision on GLES to reduce device-specific fragment artifacts
#else
"precision mediump float; \n" // Precision required for OpenGL ES3 (WebGL 2)
#endif
"in vec2 fragTexCoord; \n"
"in vec4 fragColor; \n"
"out vec4 finalColor; \n"
Expand All @@ -5077,7 +5097,11 @@ static void rlLoadShaderDefault(void)
"} \n";
#elif defined(GRAPHICS_API_OPENGL_ES2)
"#version 100 \n"
#if RLGL_ENABLE_GLES_DEFAULT_HIGHP_PRECISION
"precision highp float; \n" // Use high precision on GLES to reduce device-specific fragment artifacts
#else
"precision mediump float; \n" // Precision required for OpenGL ES2 (WebGL)
#endif
"varying vec2 fragTexCoord; \n"
"varying vec4 fragColor; \n"
"uniform sampler2D texture0; \n"
Expand Down
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