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[examples] proposal and discussion of fixed-function (i.e. GRAPHICS_API_OPENGL_11) visualization example #5320

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[examples] proposal and discussion of fixed-function (i.e. GRAPHICS_API_OPENGL_11) visualization example #5320

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44226c9
cleaner commit on review branch
meisei4 Oct 30, 2025
e552a83
add orthographic toggle and mesh cycling to prepare for branch to cor…
meisei4 Nov 1, 2025
892ec64
CI build error recheck
meisei4 Nov 1, 2025
3617ebd
one last commit before moving to models.c PR
meisei4 Nov 3, 2025
8bc6606
begin splitting up the example into a single example 200 LOC target
meisei4 Nov 8, 2025
41c9975
reduce LOC
meisei4 Nov 10, 2025
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3 changes: 3 additions & 0 deletions examples/Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -521,6 +521,9 @@ CORE = \
core/core_3d_camera_mode \
core/core_3d_camera_split_screen \
core/core_3d_picking \
core/core_3d_fixed_function_didactic \
core/core_3d_camera_view_opengl11 \
core/core_3d_camera_view_opengl33 \
core/core_automation_events \
core/core_basic_screen_manager \
core/core_basic_window \
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382 changes: 382 additions & 0 deletions examples/core/core_3d_camera_view_opengl11.c
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407 changes: 407 additions & 0 deletions examples/core/core_3d_camera_view_opengl33.c
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852 changes: 852 additions & 0 deletions examples/core/core_3d_fixed_function_didactic.c
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27 changes: 27 additions & 0 deletions examples/core/resources/models/unit_cube.obj
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@@ -0,0 +1,27 @@
o unit_cube
v -0.5 -0.5 -0.5
v 0.5 -0.5 -0.5
v 0.5 0.5 -0.5
v -0.5 0.5 -0.5
v -0.5 -0.5 0.5
v 0.5 -0.5 0.5
v 0.5 0.5 0.5
v -0.5 0.5 0.5
#comment these out to compare opengl11 planar auto fill with just using this and opengl33
vt 0.0 0.0
vt 1.0 0.0
vt 1.0 1.0
vt 0.0 1.0
s off
f 1/1 4/4 3/3
f 1/1 3/3 2/2
f 5/1 6/2 7/3
f 5/1 7/3 8/4
f 1/1 5/1 8/4
f 1/1 8/4 4/4
f 2/2 3/3 7/3
f 2/2 7/3 6/2
f 4/4 8/4 7/3
f 4/4 7/3 3/3
f 1/1 2/2 6/2
f 1/1 6/2 5/1
172 changes: 172 additions & 0 deletions examples/core/resources/models/unit_sphere.obj
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@@ -0,0 +1,172 @@
o unit_sphere
v 0.0000 0.5000 0.0000
v 0.1913 0.4619 0.0000
v 0.1353 0.4619 0.1353
v 0.0000 0.4619 0.1913
v -0.1353 0.4619 0.1353
v -0.1913 0.4619 0.0000
v -0.1353 0.4619 -0.1353
v -0.0000 0.4619 -0.1913
v 0.1353 0.4619 -0.1353
v 0.3536 0.3536 0.0000
v 0.2500 0.3536 0.2500
v 0.0000 0.3536 0.3536
v -0.2500 0.3536 0.2500
v -0.3536 0.3536 0.0000
v -0.2500 0.3536 -0.2500
v -0.0000 0.3536 -0.3536
v 0.2500 0.3536 -0.2500
v 0.4619 0.1913 0.0000
v 0.3266 0.1913 0.3266
v 0.0000 0.1913 0.4619
v -0.3266 0.1913 0.3266
v -0.4619 0.1913 0.0000
v -0.3266 0.1913 -0.3266
v -0.0000 0.1913 -0.4619
v 0.3266 0.1913 -0.3266
v 0.5000 0.0000 0.0000
v 0.3536 0.0000 0.3536
v 0.0000 0.0000 0.5000
v -0.3536 0.0000 0.3536
v -0.5000 0.0000 0.0000
v -0.3536 0.0000 -0.3536
v -0.0000 0.0000 -0.5000
v 0.3536 0.0000 -0.3536
v 0.4619 -0.1913 0.0000
v 0.3266 -0.1913 0.3266
v 0.0000 -0.1913 0.4619
v -0.3266 -0.1913 0.3266
v -0.4619 -0.1913 0.0000
v -0.3266 -0.1913 -0.3266
v -0.0000 -0.1913 -0.4619
v 0.3266 -0.1913 -0.3266
v 0.3536 -0.3536 0.0000
v 0.2500 -0.3536 0.2500
v 0.0000 -0.3536 0.3536
v -0.2500 -0.3536 0.2500
v -0.3536 -0.3536 0.0000
v -0.2500 -0.3536 -0.2500
v -0.0000 -0.3536 -0.3536
v 0.2500 -0.3536 -0.2500
v 0.1913 -0.4619 0.0000
v 0.1353 -0.4619 0.1353
v 0.0000 -0.4619 0.1913
v -0.1353 -0.4619 0.1353
v -0.1913 -0.4619 0.0000
v -0.1353 -0.4619 -0.1353
v -0.0000 -0.4619 -0.1913
v 0.1353 -0.4619 -0.1353
v 0.0000 -0.5000 0.0000
s off
f 1 3 2
f 1 4 3
f 1 5 4
f 1 6 5
f 1 7 6
f 1 8 7
f 1 9 8
f 1 2 9
f 2 3 10
f 3 11 10
f 3 4 11
f 4 12 11
f 4 5 12
f 5 13 12
f 5 6 13
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f 7 15 14
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f 9 2 17
f 2 10 17
f 10 11 18
f 11 19 18
f 11 12 19
f 12 20 19
f 12 13 20
f 13 21 20
f 13 14 21
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f 14 15 22
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f 17 25 24
f 17 10 25
f 10 18 25
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f 19 20 27
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f 26 27 34
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f 58 57 50
13 changes: 5 additions & 8 deletions src/rmodels.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1435,7 +1435,7 @@ void DrawMesh(Mesh mesh, Material material, Matrix transform)
#define GL_COLOR_ARRAY 0x8076
#define GL_TEXTURE_COORD_ARRAY 0x8078

rlEnableTexture(material.maps[MATERIAL_MAP_DIFFUSE].texture.id);
if (mesh.texcoords && material.maps[MATERIAL_MAP_DIFFUSE].texture.id > 0) rlEnableTexture(material.maps[MATERIAL_MAP_DIFFUSE].texture.id);

if (mesh.animVertices) rlEnableStatePointer(GL_VERTEX_ARRAY, mesh.animVertices);
else rlEnableStatePointer(GL_VERTEX_ARRAY, mesh.vertices);
Expand Down Expand Up @@ -4434,10 +4434,12 @@ static Model LoadOBJ(const char *fileName)

model.meshes[i].vertices = (float *)MemAlloc(sizeof(float)*vertexCount*3);
model.meshes[i].normals = (float *)MemAlloc(sizeof(float)*vertexCount*3);
model.meshes[i].texcoords = (float *)MemAlloc(sizeof(float)*vertexCount*2);
#if defined(GRAPHICS_API_OPENGL_33) || defined(GRAPHICS_API_OPENGL_ES2)
model.meshes[i].texcoords = (float *)MemAlloc(sizeof(float)*vertexCount*2);
model.meshes[i].colors = (unsigned char *)MemAlloc(sizeof(unsigned char)*vertexCount*4);
#else
if (objAttributes.texcoords != NULL && objAttributes.num_texcoords > 0) model.meshes[i].texcoords = (float *)MemAlloc(sizeof(float)*vertexCount*2);
else model.meshes[i].texcoords = NULL;
model.meshes[i].colors = NULL;
#endif
}
Expand Down Expand Up @@ -4493,16 +4495,11 @@ static Model LoadOBJ(const char *fileName)

for (int i = 0; i < 3; i++) model.meshes[meshIndex].vertices[localMeshVertexCount*3 + i] = objAttributes.vertices[vertIndex*3 + i];

if ((objAttributes.texcoords != NULL) && (texcordIndex != TINYOBJ_INVALID_INDEX) && (texcordIndex >= 0))
if ((objAttributes.texcoords != NULL) && (texcordIndex != TINYOBJ_INVALID_INDEX) && (texcordIndex >= 0) && (model.meshes[meshIndex].texcoords))
{
for (int i = 0; i < 2; i++) model.meshes[meshIndex].texcoords[localMeshVertexCount*2 + i] = objAttributes.texcoords[texcordIndex*2 + i];
model.meshes[meshIndex].texcoords[localMeshVertexCount*2 + 1] = 1.0f - model.meshes[meshIndex].texcoords[localMeshVertexCount*2 + 1];
}
else
{
model.meshes[meshIndex].texcoords[localMeshVertexCount*2 + 0] = 0.0f;
model.meshes[meshIndex].texcoords[localMeshVertexCount*2 + 1] = 0.0f;
}

if ((objAttributes.normals != NULL) && (normalIndex != TINYOBJ_INVALID_INDEX) && (normalIndex >= 0))
{
Expand Down
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