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Fixes gl state after HDR texture functions. (#1621)

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Updates skybox demo to show how to do both HDR and non HDR skyboxes

Co-authored-by: Jeffery Myers <JefMyers@blizzard.com>
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Jeffery Myers 2021-02-28 14:31:25 -08:00 • committed by GitHub
parent b64fe4dfed
commit 0f10c44578
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5 changed files with 67 additions and 28 deletions
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71
examples/models/models_skybox.c
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@ -10,6 +10,9 @@
********************************************************************************************/
#include "raylib.h"
#include "rlgl.h"
bool useHDR = false;
int main(void)
{
@ -35,7 +38,8 @@ int main(void)
skybox.materials[0].shader = LoadShader("resources/shaders/glsl100/skybox.vs", "resources/shaders/glsl100/skybox.fs");
#endif
SetShaderValue(skybox.materials[0].shader, GetShaderLocation(skybox.materials[0].shader, "environmentMap"), (int[1]){ MAP_CUBEMAP }, UNIFORM_INT);
SetShaderValue(skybox.materials[0].shader, GetShaderLocation(skybox.materials[0].shader, "vflipped"), (int[1]){ 1 }, UNIFORM_INT);
SetShaderValue(skybox.materials[0].shader, GetShaderLocation(skybox.materials[0].shader, "doGamma"), (int[1]) { useHDR ? 1 : 0 }, UNIFORM_INT);
SetShaderValue(skybox.materials[0].shader, GetShaderLocation(skybox.materials[0].shader, "vflipped"), (int[1]){ useHDR ? 1 : 0 }, UNIFORM_INT);
// Load cubemap shader and setup required shader locations
#if defined(PLATFORM_DESKTOP)
@ -45,18 +49,29 @@ int main(void)
#endif
SetShaderValue(shdrCubemap, GetShaderLocation(shdrCubemap, "equirectangularMap"), (int[1]){ 0 }, UNIFORM_INT);
// Load HDR panorama (sphere) texture
char panoFileName[256] = { 0 };
TextCopy(panoFileName, "resources/dresden_square_2k.hdr");
Texture2D panorama = LoadTexture(panoFileName);
char skyboxFileName[256] = { 0 };
// Generate cubemap (texture with 6 quads-cube-mapping) from panorama HDR texture
// NOTE 1: New texture is generated rendering to texture, shader calculates the sphere->cube coordinates mapping
// NOTE 2: It seems on some Android devices WebGL, fbo does not properly support a FLOAT-based attachment,
// despite texture can be successfully created.. so using UNCOMPRESSED_R8G8B8A8 instead of UNCOMPRESSED_R32G32B32A32
skybox.materials[0].maps[MAP_CUBEMAP].texture = GenTextureCubemap(shdrCubemap, panorama, 1024, UNCOMPRESSED_R8G8B8A8);
if (useHDR)
{
TextCopy(skyboxFileName, "resources/dresden_square_2k.hdr");
UnloadTexture(panorama); // Texture not required anymore, cubemap already generated
// Load HDR panorama (sphere) texture
Texture2D panorama = panorama = LoadTexture(skyboxFileName);
// Generate cubemap (texture with 6 quads-cube-mapping) from panorama HDR texture
// NOTE 1: New texture is generated rendering to texture, shader calculates the sphere->cube coordinates mapping
// NOTE 2: It seems on some Android devices WebGL, fbo does not properly support a FLOAT-based attachment,
// despite texture can be successfully created.. so using UNCOMPRESSED_R8G8B8A8 instead of UNCOMPRESSED_R32G32B32A32
skybox.materials[0].maps[MAP_CUBEMAP].texture = GenTextureCubemap(shdrCubemap, panorama, 1024, UNCOMPRESSED_R8G8B8A8);
UnloadTexture(panorama); // Texture not required anymore, cubemap already generated
}
else
{
Image img = LoadImage("resources/skybox.png");
skybox.materials[0].maps[MAP_CUBEMAP].texture = LoadTextureCubemap(img, CUBEMAP_AUTO_DETECT);
UnloadImage(img);
}
SetCameraMode(camera, CAMERA_FIRST_PERSON); // Set a first person camera mode
@ -82,12 +97,22 @@ int main(void)
{
// Unload current cubemap texture and load new one
UnloadTexture(skybox.materials[0].maps[MAP_CUBEMAP].texture);
panorama = LoadTexture(droppedFiles[0]);
TextCopy(panoFileName, droppedFiles[0]);
// Generate cubemap from panorama texture
skybox.materials[0].maps[MAP_CUBEMAP].texture = GenTextureCubemap(shdrCubemap, panorama, 1024, UNCOMPRESSED_R8G8B8A8);
UnloadTexture(panorama);
if (useHDR)
{
Texture2D panorama = LoadTexture(droppedFiles[0]);
// Generate cubemap from panorama texture
skybox.materials[0].maps[MAP_CUBEMAP].texture = GenTextureCubemap(shdrCubemap, panorama, 1024, UNCOMPRESSED_R8G8B8A8);
UnloadTexture(panorama);
}
else
{
Image img = LoadImage(droppedFiles[0]);
skybox.materials[0].maps[MAP_CUBEMAP].texture = LoadTextureCubemap(img, CUBEMAP_AUTO_DETECT);
UnloadImage(img);
}
TextCopy(skyboxFileName, droppedFiles[0]);
}
}
@ -102,11 +127,19 @@ int main(void)
ClearBackground(RAYWHITE);
BeginMode3D(camera);
DrawModel(skybox, (Vector3){0, 0, 0}, 1.0f, WHITE);
rlDisableBackfaceCulling();
rlDisableDepthMask();
DrawModel(skybox, (Vector3){0, 0, 0}, 1.0f, WHITE);
rlEnableBackfaceCulling();
rlEnableDepthMask();
DrawGrid(10, 1.0f);
EndMode3D();
DrawText(TextFormat("Panorama image from hdrihaven.com: %s", GetFileName(panoFileName)), 10, GetScreenHeight() - 20, 10, BLACK);
if (useHDR)
DrawText(TextFormat("Panorama image from hdrihaven.com: %s", GetFileName(skyboxFileName)), 10, GetScreenHeight() - 20, 10, BLACK);
else
DrawText(TextFormat(": %s", GetFileName(skyboxFileName)), 10, GetScreenHeight() - 20, 10, BLACK);
DrawFPS(10, 10);
EndDrawing();